1. Give the slow cooker a quick spray with cooking oil to prevent sticking.
2. Add all the ingredients, and secure the lid.
3. Cook on low for eight hours or overnight.
4. In the morning, scoop out one quarter of the oatmeal, and add your favorite toppings.
5. Leftovers can be stored in the fridge and reheated throughout the week in a microwave-safe bowl.

Image Source: Calorie Count [1]

Below are the calorie counts of some of my favorite flavor combinations.

Banana Cashew Oatmeal

• 1/4 slow-cooker steel-cut oats: 176 calories, 5.5 grams fiber, 5.9 grams protein
• 1 teaspoon maple syrup: 17 calories [2], 0 grams fiber, 0 grams protein
• 1 small banana, sliced: 89 calories [3], 2.6 grams fiber, 1.1 grams protein
• 8 salted cashews, chopped: 72 calories [4], .4 gram fiber, two grams protein

Total: 354 calories, 8.5 grams fiber, 9 grams protein

Blueberry Mango Oatmeal

• 1/4 slow-cooker steel-cut oats: 176 calories, 5.5 grams fiber, 5.9 grams protein
• 1 teaspoon maple syrup: 17 calories [5], 0 grams fiber, 0 grams protein
• 1/4 blueberries: 21 calories [6], .9 gram fiber, .3 gram protein
• 1/4 cup mango: 25 calories [7], .7 gram fiber, .3 gram protein
• 20 pistachios: 79 calories [8], 1.4 grams fiber, 3 grams protein

Total: 318 calories, 8.5 grams fiber, 9.2 grams protein

Apple Date Pecan Oatmeal

• 1/4 slow-cooker steel-cut oats: 176 calories, 5.5 grams fiber, 5.9 grams protein
• 1 teaspoon maple syrup: 17 calories [9], 0 grams fiber, 0 grams protein
• 1/2 apple, chopped: 47 calories [10], 2.1 grams fiber, .2 gram protein
• 1 Medjool date, chopped: 66 calories [11], 1.6 grams fiber, .4 gram protein
• 8 pecans, chopped: 78 calories [12], 1.2 grams fiber, 1.2 grams protein

Total: 367 calories, 10.4 grams fiber, 7.7 grams protein

Coconut Almond Chocolate Oatmeal

• 1/4 slow-cooker steel-cut oats: 176 calories, 5.5 grams fiber, 5.9 grams protein
• 1 teaspoon maple syrup: 17 calories [13], 0 grams fiber, 0 grams protein
• 1 tablespoon unsweetened shredded coconut: 45 calories [14], 2 grams fiber, 1 gram protein
• 10 raw almonds, chopped: 69 calories [15], 1.4 grams fiber, 2.6 grams protein
• 1 tablespoon (23) dairy-free chocolate chips (I used Ghirardelli Semi-Sweet Chips): 50 calories [16], 0 grams fiber, 0 grams protein

Total: 357 calories, 8.9 grams fiber, 9.5 grams protein